"An unexpected treasure has been discovered by two sharp-eyed charity bookshop volunteers.

Christine and Robert Williams were sorting through the latest delivery of donations to the National Trust’s second-hand bookshop at Mottisfont,when they came across a small, hardback book, complete with beautifully illustrated dust jacket.

It was a rare 1956 first edition of the children’s novel, The Last Battle, by CS Lewis, which could be worth £1,000. "